Bobbin drag device for wrapping machines and the like



April 2, 1935. 1,996,450

BOBBIN DRAG DEVICE FOR WRAPPING MACHINES AND LIKE Filed May 21, 1932 INVENTOR= Annand Bes. B7. i/ fzmy fifty:

Patented Apr. 2, 1935 UNITED STATES PATENT OFFICE Armand Bs, Paris, France,- assignor to William Oliver Larmuth, Alpraham,

Cheshire, England near Tarporley,

Application May 21, 1932, Serial No. 612,805 In France July 31, 1931 3 Claims.

In numerous looms using various materials wound up on bobbins or rollers, the braking of these bobbins or rollers must be subject to contradictory conditions if a gentle and uniform un- 5 winding is to be ensured at all times, that is to say, at the starting up, in normal running and on stopping.

The object of the present invention is to obtain an easy and variable braking action over 10. a wide range and which can be actuated either by hand or automatically through a regulating device even during the rotation of the bobbin.

In the arrangement described an example only has been given of a roller with roll of paper wound on it, disposed on the platform of a wrapping machine, but the invention is applicable to all material disposed in a different manner notably on bobbins or rollers.

In the single figure of the drawing given by way of illustration and which diagrammatically shows the new arrangement, a spindle of any kind I carries a loose pulley 2 and a fixed pulley 3 and on the other hand a bevel wheel 4 driving another bevel wheel 5 the stub shaft 5 of which rotates in a bore formed in the main support 6.

On the end of the spindle 5 of the pinion wheel 5 which is preferably of non-magnetic metal such as bronze, is screwed a member I of magnetic metal, carrying two brass nipples 8. On the memher I, is fitted and rendered integral therewith, a plate 9 of non-magnetic metal or of fibre, wood and so on. On this plate is disposed either loose or fixed according to the braking effect desired, a felt I on which bears the paper roll I I. On the roll rests a disc of magnetic metal bearing by its own weight on the roll I I and which, having two holes corresponding to the nipples 8, cannot move in the horizontal plane except in conjunction with the socket. The paper I3 coming from the roll I I passes over the hook I4 and accomplishes its braiding work around a core passing in a bore formed through all the centre parts. The height of the part I is calculated in such a manner that, given the thickness of the paper and of the felt IE], the plate I2 rests on the paper and not the member I from which it is separated by a small space.

Around the core I and separated from it by a suitable air-gap, is disposed an electro-magnet I secured on the support 6. This electro-magnet is energized by a current coming from a source of supply 25 and which circulates through the wires 21 and a movable contact 23 and through a rheostat 28. The wire leading the current to the contact 23 is likewise in communication with the rheostat 28 through an adjustable contact 22, its two studs 21], 2|, the metal spring IS, the metal part 26 and the movable contact 24.

The driving shaft I6 carrying the belt shipper I'I receives at its extremity an insulating wiper I8 integral with the shaft I6 and bearing on the other hand on the spring I9 which is arranged at a slight angle in relation to the shaft I6 as shown in the drawing.

If the assemblage is not in action, the shaft I6, the forks I1 and the wiper I8 occupy the position indicated on the drawing. The belt is on the fixed pulley 3, the bevel pinion wheels 4 and 5 mesh together and set in rotation the iron member I as well as the plate 9 and the disc I2 which are integral with one another. The paper I3 which winds onto a core 29 and which is drawn along step by step in a well known manner, therefore passes from the roller II disposed in a suitable plane for unwinding, and which is slightly compressed onto the felt ID by the weight of the disc I2. This pressure already exerts a certain braking action. But in addition, the electric current circulating through the electro-magnet l5 energizes the core I which creating an attraction of the disc I2 increases the pressure and consequently the braking action. By displacing the movable contact 23 downwardly and by opening up the rheostat, there is first brought about a diminution and then an interruption of the electric circuit and consequently no braking action; by moving it upwardly, the resistance interpolated is decreased and in consequence causes a more energetic braking action.

When the machine stops the shaft I6 is displaced and causes the belt to move onto the loose pulley 2; simultaneously the wiper I8 causes the spring I9 to descend and brings the contact between the studs 20, 2|. The current instead of passing through the rheostat is therefore sent directly to the electro-rnagnet I5 and can produce an energetic braking action which opposes the inertia of the roller and the sudden unwinding which results. By displacing the movable contact 24 downwardly, this braking action is reduced at the stopping of the machine. In starting up again the shaft I4 is again displaced, the spring I9 lifts and cuts the current in this portion of the circuit and the current takes the value determined by the position of the movable contact 23.

It is therefore possible by displacing the contact arms and by unwinding the roller in a suitable direction to obtain at any moment and even during running, the braking action required and an automatic variation thereof at the stopping of the loom.

It is also possible to cause the electro-magnet to turn with the core 1 and supply current through appropriate contact brushes.

I claim: V r

1. A bobbin'drag device for wrapping machines and the like comprising a bobbin containing material for wrapping, a magnetic member on one netic field for causing said braking action, the

strength of the braking action being altered by varying the strength of the magnetic field.

2. A bobbin drag device for wrapping machines and the like comprising a bobbin containing the wrapping material, a disk of magnetic metal dis- 7 posed upon said bobbin, a disk of non-magnetic material disposed beneath said bobbin, an electro-magnet, an electric circuit, the electro-magnet being in said circuit, a rotary core member to said electro-magnet, said core member being disposed beneath said non-magnetic disk and a rheostat in said circuit varying the electro-magnetic flux for modifying the braking action.

3. A bobbin drag device for wrapping machines and the like comprising a bobbin containing the wrapping material, a disk of magnetic metal dismeans for shunting said rheostat for varying the braking efiect.

ARMAND BEs. 

